Quarterly report pursuant to Section 13 or 15(d)

ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details)

v3.21.1
ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Total ALLL balance $ 1,703 $ 1,504 $ 1,814 $ 783
Financing Receivable, Allowance for Credit Loss, Writeoff (95) (136)    
Allowance for Loan and Lease Loss, Recovery of Bad Debts 31 19    
Provision For (Reduction In Allowance) Loan and Lease Losses. (47) 447    
Provision (reduction in allowance) for unfunded loan commitments and letters of credit (13) (6)    
Additions to Unfunded Loan Commitments and Letters of Credit Allowance (1) (1)    
AULC Balance 38 99 52 104
Acl Balance End Of Period 1,741 1,603 1,900  
Allowance for credit loss, change since adoption (125)      
ASU 2016-13        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Total ALLL balance       391
Consumer        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Total ALLL balance 506 508 578 231
Financing Receivable, Allowance for Credit Loss, Writeoff (34) (48)    
Allowance for Loan and Lease Loss, Recovery of Bad Debts 19 14    
Provision For (Reduction In Allowance) Loan and Lease Losses. (57) 100    
Provision (reduction in allowance) for unfunded loan commitments and letters of credit (7) (1)    
Additions to Unfunded Loan Commitments and Letters of Credit Allowance 0 0    
AULC Balance 11 41 18 2
Acl Balance End Of Period 517 549    
Consumer | ASU 2016-13        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Total ALLL balance       211
Commercial and industrial        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Total ALLL balance 1,197 996 1,236 552
Financing Receivable, Allowance for Credit Loss, Writeoff (61) (88)    
Allowance for Loan and Lease Loss, Recovery of Bad Debts 12 5    
Provision For (Reduction In Allowance) Loan and Lease Losses. 10 347    
Provision (reduction in allowance) for unfunded loan commitments and letters of credit (6) (5)    
Additions to Unfunded Loan Commitments and Letters of Credit Allowance (1) (1)    
AULC Balance 27 58 34 102
Acl Balance End Of Period $ 1,224 $ 1,054    
Commercial and industrial | ASU 2016-13        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Total ALLL balance       $ 180
Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
AULC Balance     2  
Cumulative Effect, Period of Adoption, Adjustment | Consumer | ASU 2016-13        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
AULC Balance     40  
Cumulative Effect, Period of Adoption, Adjustment | Commercial and industrial | ASU 2016-13        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
AULC Balance     $ (38)